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6 3 YW N 1 zw Mew y T ,l M" v 0L M, m fv my w ak ,www 3 uw V .NMmV/ ff @K5 R 6, /MW m. .fm 2 m A a SS 4 W G 2 mf M HW E Mm uw YM nwv Lm EI Kw .M Dm H F m 5 V E I| D O 3 5 l w 5, n n w. fw A C y m m M m March 3, 1953 H. D. KELLEY ET AL 2630176 DEVICE FOR REMOVING WORN BRAKE LININGS Filed April 5, 1950 2 SHEETS- SHEET 2 ATTORNEY Patented Mar. 3, 1 953 DEVICE FOR REMOVING WORN BRAKE LININGS Herbert D. Kelley and Willis E. Knott, Akron, Ohio, assignors to Quality Tool & Machine, Akron, Ohio, a partnership Application April 5, 1950, Serial No. 154,088

4 Claims.

This invention relates to apparatus for removing worn brake linings adhesively adhered to brake shoes.

The current practice of fastening linings to brake shoes is to bind the two together by some suitable adhesive. This invention provides an efficient but inexpensive device for removing linings so adhered to a brake shoe after the linings have been worn down to the point where they are no longer useful. The device is exceedingly simple in structure and in its mode of operation.

The device includes means for supporting a worn brake shoe and a knife adapted for cutting the worn lining from the shoe. Means is provided to produce relative movement between the shoe and the knife so that the worn lining is cut from the shoe. In the preferred device the shoe-supporting means is rotated so that the brake shoe is moved relatively to the cutting edge of the knife. The shoe-supporting means is preferably rotated manually by a suitable handle a1- though a motor or the like may be provided for this purpose. In the preferred device designed for manual operation, connected between the handle and the shoe-supporting means is a mechanism such as a gear train or the like to increase the mechanical advantage of the device. The

distance between the knife and the center of -ro tation of the shoe-supporting means may be changed from time-to-time in order for the de vice to accommodate shoes of different sizes. The knife is pivotally supported so that the angle at which it is presented to the surface of the brake shoe may be adjusted.

In the preferred shoe-supporting means only the forward end of a brake shoe is anchored to the supporting means to cause the brake shoe to rotate with the supporting means, the balance of the shoe being supported on the supporting means but not being fastened thereto.

The invention will be further discussed in connection with the accompanying drawings which show a device designed for manual operation and illustrate the manner of using it.

Fig. 1 is a front elevation of the device in use;

Fig. 2 is a view of the device taken from the right side of Fig. 1 (omitting the brake shoe and lining shown in Fig. l)

Figs. 3 and 4 are cross-sectional views taken on the lines 3-3 and 4--4 respectively of Fig. 1;

Figs. 5 and 6 are elevational views of the preferred gear mechanism taken on the lines 5-5 and 6 6 respectively of Fig. 2;

Fig. 7 is a detail of the preferred means for mounting a brake shoe on the mandrel, the view being taken on the line 'l-1 of Fig. `1; and

Fig. 8 is an enlarged view of the knife support taken on the line 8-8 of Fig. 1.

The frame of the device is preferably a casting having two vertical, parallel plates I and 2 extending upwardly from a plate 3 which may be anchored to a workbench or other suitable working surface. A shaft 5 is supported between the vertical plates and it may be rotated by applying turning force to the rods 6 which extend radially outward from a hub 8 fastened on the end of the shaft which extends through plate 2. Shaft 5 operates a spur gear train located between the vertical plates which in turn rotates a mandrel I 2.V The mandrel supports a brake shoe I3 havthe worn lining I4 is out away from the flange.`

The turning force applied to the rods E is compounded by the gear train to turn the mandrel with the force necessary for the knife to shear 5 the worn lining away from the brake shoe flange.

Figs. 5 and 6 show a preferred spur gear train (In these figures used to rotate the mandrel. teeth are indicated only at the point Where one gear is meshed with another.) The gear 22 is rigidly fastened (preferably welded) to shaft 5 so that it rotates with the shaft and is meshed with a smaller gear 23 which is rotatably mounted on a stub shaft 24 projecting from the inner surface of plate 2. Gear 23 is meshed with a gear l 25 which is rotatably supported on a shaft 21 extending between the vertical plates I and 2. As shown in Fig. 2 these gears are mounted one below the other next to the inner surface of plate 2. Gear 28 is also rotatably mounted on shaft 2l but is next to the inner surface of plate I. Gear 28 and gear 25 are each welded to a spacer 29 (Fig. 2) which separates these gears so that the gear 28 and gear 25 rotate together.

Gear 28 is meshed with a gear `3| which is rigidly mounted next to the inner surface of plate I on a shaft 32. Shaft 32 is offset from the other gear shafts and it is rotatably supported between the plates I and 2. Itextends through plate I and a pinion 33 (Fig. 5) is fastened to it next to the outer surface of plate I. Gear 3I and pinion 33 are each welded to shaft 32 so that they rotate together. This pinion is meshed with a main gear 34 which is rotatably mounted on the end of shaft and held by a cap 35 which bears against the hub 36 of gear 34 and is fastened to the end of the shaft by the bolt 31. The mandrel I2 is bolted to the outer face of main gear 34 as shown in Fig. 3 and rotates with the main gear as this gear is driven by pinion 33.

Other forms of gearing may be substituted for the gearing illustrated. The gearing shown is used for manually operated models. If a motor or other power unit is to be used to operate the device it may be desirable to modify the preferred mechanism somewhat. For example the mandrel might be rigidly fastened directlyv to supporting shaft 5 and the shaft rotated by turning a worm engaged with a worm gear rigidly fastened to shaft 5. Any mechanism capable of providing the desired mechanical advantage may be used to transmit the force applied to the actuating means, suchras the rods 6 ora motor, etc. to the mandrel.

The preferred mandrel: I 2 is shown in cross section in Fig. 3. The. mandrel is cylindrical in shape and around its curved surface there is a peripheral groove 40. which extendsy radially inwardly. Several mandrels each of the same de sign but of different diameters. will beprovided for. eachv device: to accommodate brake shoes of dierent sizes- The. curvature of thei mandrels surfacewill be. substantially equal. to the curvature of the brake shoe to be cleaned so that the undersurfacey of the brake shoes flange I5 ts flat against` the curved surface of themandrel andthe brake shoes web 42 fits into the peripheral groove 40. The interiorl web` portion 44v of the. mandrel is relatively. thin andts atagainst the outer surface of the mainv gear 34. An opening 45 at the center of the mandrel fitsy over the cap 35v and the gear hub 36. Lugs or bolts 41 tthrough holes 48-in the'web-44 and are threaded into tapped= holes 49' in the outer surface of the main gear 34 to fasten the mandrel to the gear. The location. of the holes through which the bolts 41 extend will be identical for eachA ofthe different size mandrels: so that the mandrels are interchangeable on the device.r Tov remove a. mandrel it is merely necessary to loosen thev bolts. 41 and. pullthe.- mandrel oif the gear hubl 36. A different. size mandrelis then placed on thegear hub andthe bolts 41 reinsertedthrough the holes 48 and threaded` into thel face of the main gear 34'.V

The knife block lawhichis. the unit supported:

by the. arm I9. includes a base plate 5I4 with a stud 52 extending, perpendicularly from one side.

of the plate (see, Eig.. 8). The. inner. vend 53 of;

the stud' is` press-fitted. into the. base plate and a..

threadedshank 54' extends from this press-fitted portion through the base plate.. The base plate 5I fits into a channel 55`which isv formed along the front face of the arm I9. When the base is in this channel the studs shankV 54. extends through a longitudinally disposed slot 5.5 which.

isformed through the center of the army and. also ts through a bar 51 which iits'into a groove 58 formed along the back face of the arm I9 on each side of slot 55. The knife block may be adjusted to various positions on the arm by sliding the base plate backY and forth in the channel 55; At any desired position on the arm the baseY plate 5l may be fastened rigidlytov the arm by tightening a knob 5`9 threaded onto the shank 54`and also by tightening a bolt 60 which extends through the bar 5-1, throughY the slot 58 and is.

threaded. into` the base plate (see Fig. 4).

'llo` adjust the knife block to aA particularv posi*- tion on the arm I9 the bolt 60 and the knob 59 are loosened and the base plate is slid along the channel to the desired position. The studs shank 54 and the bolt 69 slide freely along in slot 56 as the base plate and bar 51 are moved back and forth in the channel, At a desired position the knob 59 isA tightened by hand and then bolt 60 is tightened to anchor the base plate firmly in place. As this bolt and knob are tightened the bar 51 and the base plate 5I are drawn up tightly against their respective sides of the arm I9 so that the knife block is held securely.

The stud 52 supports a knife holder 6I to which the knife blade I1 is fastened by the bolts 63. A threaded shank 54 formed on the outer end of the stud extends beyond the side of the knife holder. A knob 65 vis threaded onto this outer shank 64 and is adapted to be tightened against a washer S6 which presses against the outside edge. of the knife holder and retains thev knife holder on the stud. The knife holder 6I is pivotal about the stud when knob E5 is loosened.. The angle at which the knife blade I1 is directed toward the mandrel is regulatedby the knob screws 61 and 58 which are mounted in the bosses 69 next to the upper and lower edges of the base plate 5I. Screw 51 is threaded through its boss to press againstv the portion of the. knife holder above the stud. and screw 58 isY threaded through its boss to press against the portion ofthe knife holder below the stud. When the screws 61 and 68 are adjusted to hold the knife at a particular angle, knob 65 is then tightened against the side of the knife holder to hold it rigidly' against the base plate.

,The boss 69 near the upper4 edge of base plate 5I- is provided with a projection 10, the upper surface of which is flush with the upper surface, of arm I9. An indicating mark 1l. (see Fig. 8) is formed on the upper surface of the projection and. this mark is adapted to register with the calibrations12 along the. upper surface of arm I9 which indicate the approximate positions at which the knife block should be located for various types of. brake shoes.

Tow operate,` the device a: brake shoe: having a worn lining to be` removed isplacedon the upper` portion of the. mandrel I2 with its web 42 extending into groovew and its flangeV I5 resting onv the cylindrical surface of the. mandrel. The edge of the mandrel is provided with several circumferential slots 13 located at spaced. intervals. The sidewalls 14 of each slot 13 are: not radial but they slant away from a radial direction so that when the mandrel is rotated to a position where the slot is adjacent knife I1 the sidewallsof the slot will slant upwardly away from the' knife. In other words, they slanty inwardly away from the forward end of the brake shoe which is being. cleaned; they slant away from the direction in which the mandrel is rotated. The brake shoe:

through one of. these holes. They pin lies. paralleli with the sidewallsurface: .14. of the slotV 13 in which itis fitted. andl as. shown inV Fig. it ,prof jects on each side of theweb and bears against the slots upper sidewall. Only the forward portion of the brake. shoe is anchored to' the man.- drel in this manner. Y

The knife block is adjusted so that the cutting edge of the knife is sufficiently close to the flange of the brake shoe to cut away the worn lining, the knob screws El and B8 are adjusted to regulate the angle at which the knife blade is directed toward the brake shoe, and the knob 65 is tightened. As the mandrel is rotated by turning the rods 6 the knife blade peels the worn lining away from the flange as indicated in Fig. 1. A considerable force is required to move the brake shoe flange across the cutting edge of the knife to remove the worn lining. Due to the shape of the slots sidewalls the pin I6 has a tendency to slide down the upper sidewall toward the bottom of the slot 'I3 as the pressure against the knife increases. This action of the pin 16 holds the brake shoe tightly against the mandrel.

When the mandrel has moved the brake shoe through the necessary arc for the knife to have cut away all of the worn lining, the pressure of the brake shoe against the mandrel is automatically released immediately and the brake shoe falls away from the mandrel. Another brake shoe is then placed on the upper surface of the mandrel with a pin similar to pin 16 extending through one of the holes in the forward end of the web of the brake shoe, and the same operation repeated.

The knife removes the worn lining cleanly. The frame of the device is of heavy construction to withstand the large force required to remove the lining. In the preferred device a suitable hood (not shown) will be used to enclose the gears between the plates l and 2 and also the main gear 34. The invention is deilned in the appended claims.

What we claim is:

1. A support for a brake shoe which has a hole near one end of its web, the support having a curved outer surface and being adapted for rotation in one direction in equipment designed for removal of worn lining adhered to the brake shoe, said curvature of the outer surface of the support being the same as the flange of the brake shoe adapted to be supported thereon, a groove in said surface adapted to receive the web of said brake shoe, and several slots in the surface the backward edge of each of which slants away from the direction in which the support is adapted to rotate and is deep enough to expose said hole.

2. A support for a brake shoe which has a hole near one end of its web, the support having a curved outer surface and being adapted for rotation in one direction in equipment designed for removal of worn lining adhered to the brake shoe, said curvature of the outer surface of the support being the same as the flange of the brake shoe adapted to be supported thereon, a groove in said surface adapted to receive the web of said brake shoe, and a slot in the surface the backward edge of which slants away from the direction in which the support is adapted to rotate and is deep enough to expose said hole.

3. A device for cutting a worn lining from a. brake shoe to which it is adhesively adhered, the brake shoe having a hole near one end of its web, which device includes a support having a curved outer surface, said curvature of the surface of the support being the same as the flange of the brake shoe, and a groove in said surface to accommodate the web of the brake shoe, there being a slot in said surface which exposes said hole in the web and slants away from the direction in which the support is adapted to rotate. means for rotating the support in said direction which includes gear mechanism for compounding the force applied for rotation of the support, and a knife adjustably supported with its cutting edge in a plane perpendicular to the plane of rotation, which knife is adapted to cut lining adhesively secured to the brake shoe as the support is rotated.

4. A support for a brake shoe having a hole through one end thereof, which support is adapted for mounting on a rotatable member, the support providing a surface which is complementary to the curved flange of said brake shoe and is provided with a groove adapted to accommodate the web of the shoe, slot means in said surface which is adapted to engage means inserted through said hole in the brake shoe when the brake shoe is on top of the support, the backward edge of said slot means slanting away from the direction in which said rotatable means is adapted to be rotated whereby when the support is rotated so that the brake shoe is no longer on top of the support automatic downward release of the brake shoe from the support is facilitated.

HERBERT D. KELLEY. WILLIS E. KNOTT.

REFERENCE S CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 100,771 Kavanagh Mar. l5, 1870 442,399 Safford Dec. 9, 1890 654,724 Gage July 3l, 1900 923,552 Mill June 1, 1909 1,595,203 McClain Aug. 10, 1926y 1,624,913 Ames Apr. 19, 1927 1,628,840 Heys et al May 17, 1927 1,653,104 Kimmerling Dec. 20, 1927 1,945,883 Connely Feb. 6, 1934 1,969,068 Freeman Aug. 7, 1934 2,496,657 Carnes Feb. 7, 1950 2,583,161 Urbano Jan. 22, 1952 

